Pumping mechanism



Feb. 25, 1941. A. L. McHUGH 2,233,268

PUMPING MECHANISM Filed Mardh 24, 1959 PH-S ATTORNEY Patented Feb. 25, 1941 UNITED STATES PATENT OFFICE PUMPING MECHANISM Anthony L. -MeHugh, Easton, Pa., assignor to Ingersoll-Rand Company, Jersey City, N. J., a corporation of New Jersey Application March 24, 1939, Serial No. 263,847

Claims. (Cl. 103-111) Thisinvention relates to pumping mechanisms, ends of the train of packing members to serve and more particularly to a pump of the cenits well known function. trifugal type in which the impeller and the shaft The packing 33 is compressed by the usual carrying it are in telescopic engagement with gland 35 actuated toward the packing by bolts 5 each other. 36 which, in accordance with the practice of the 5 One object of the invention is to facilitate the invention, are arranged in slots 31 formed in lugs operation of removing the impeller from the 38 on diametrically opposite sides of the stufling shaft. box 23. The bolts 36 extend through apertures Another object of the invention is to enable 39 and are of considerable length so that the the utilization of constituent parts of the pump gland will be capable of a wide range of move- 10 for effecting the removal of the impeller from ment longitudinally of the shaft without moving the shaft, out of engagement with the bolts, and on the Other objects will be in part obvious and in bolts 36 are long threaded portions 40 to receive part pointed out hereinafter. nuts 4| which seat against the outer end of the In the drawing accompanying this specificagland for pressing it against the packing. 15 tion and in which similar reference numerals In order to enable the packing compressing refer to similar parts, device, namely the gland 35 and the bolts--36,

Figure 1 is a longitudinal elevation, in section, to serve as an instrumentality for removing the of a portion of a centrifugal pump showing the impeller 22 from the shaft, a collar 42 is interposition which the parts normally occupy, posed between the sleeve 3| and a shoulder 43 20 Figure 2 is a similar view illustrating the posiat the juncture of the main body portion of the tions of the parts during the removal of the shaft and the reduced portion l9. Inthe periphimpeller from the shaft, and ery of the collar 42 is an annular groove 44 to Figure 3 is a perspective view of a detail. receive a U-shaped washer 45 which, when the Referring more particularly to the drawing, the gland 35 is retracted from the packing 33, lies in 2 pump, of which only so much is shown as will the path of the gland to act as an abutment serve to illustrate a practical application of the therefor. invention, comprises a casing 20 having a pump- Thus, whenever it is intended to remove the ing chamber 2| to accommodate an impeller 22 impeller from the shaft and with the washer 45 which carries the usual wearing rings 23 on its in position in the groove 44 it is merely neces- 30 hub portion. sary to thread down the nuts 4| on the bolts 36.

The impeller is mounted upon a reduced ex- The force thus applied to the gland will be transtension 24 of a shaft 25 and is" held in position mitted through the washer 45, the collar 42 and by a nut 26 threaded on the end of the extension. the sleeve 3| to the impeller for forcing it from A key 21 embedded in the extension 24 and in the extension 24. 35 the impeller forms an interlocking connection After the impeller has been thrust from the between the two, and at the opposite ends of shaft the washer 45 is removed from the groove the bore of the impeller are gaskets 28 to pre- 44 and the gland 35 is then again restored to the vent leakage of liquid along the cooperating surpacking compressing position shown in Figure l.

faces of the impeller and the extension 24. I claim: 40

The shaft 25 extends through a stufiing box 1. In combination, a pump having a casing, a 29 and through a bearing 3!! beyond which it shaft therein, an impeller on the shaft, packing may be connected to a suitable prime mover (not for the shaft, a compressor for the packing, and shown). The portion IQ of the shaft lying within means for transmitting force from the comthe stufling box is also of smaller diameter than pressor to the impeller; for removing the im- 45 the shaft proper and is encircled by a sleeve 3| peller from the shaft including a removable memwhich abuts the innermost sealing member 28 her adapted to be disposed in the path of the and is locked to the shaft by a key 32. The sleeve compressor to serve as an abutment for the serves as a renewable bearing surface for the compressor.

adjacent portion of the shaft and may be con- 2. In combination, a pump having a casing, a 50 veniently replaced when its surface becomes shaft therein, an impeller on the shaft, a packing marred by the packing 33 in the stuffing box. in the casing for the shaft, a compressor for the The packing 33 is of the pliable, compressible packing, means encircling the shaft for transtype arranged in rings in the stuffing box and a mitting force from the compressor to the imlantern gland 34 is arranged intermediate the peller for removing the impeller from the shaft, 55

and means interlockingly engaging the first said means to form an abutment for the compressor.

3. In combination, a pump having a casing, a shaft therein, an impeller on the shaft, a packing in the casing for the shaft, a compressor for the packing, a sleeve slidable on the shaft abutting the impeller, and a shoulder for the sleeve to engage the compressor for transmitting force from the compressor to the sleeve for removing the impeller from the shaft.

shaft in the casing, an impeller on the shaft, a packing in the casing for the shaft, a compressing device for the packing comprising a gland and bolts for actuating the gland, sleeve means slidable on the shaft abutting the impeller, and means to form an interlocking connection between the gland and the sleeve means to permit the transmission of force from the compressing device to the impeller for removing the impeller from the shaft.

5. In combination, a pump having a casing, a shaft in the casing having an impeller thereon, a packing in the casing for the shaft, a compressing device for the packing comprising a gland and bolts for actuating the gland, sleeve I means slidable on the shaft'abutting the impeller 4. In combination, a pump having a casing, a

and having a shoulder, and a U-shaped member to form a connection between the shoulder and the gland and thereby permit the transmission of force from the compressing device to the impeller for removing the impeller from the shaft.

ANTHONY L. McHUGH. 

